Method and composition for tar removal



wlll-efiectlvely and rapitdalg Patented June 13-, 1933' UNITEDSTATES PATENT OFFICE ROBERT B. VALLEE, OF PHILADELPHIA, rmmvmm, ASSIGHOB 1'0 m was BOLVEHTS CORPORATION, OF PHILADELPHIA, PENNSYLVANIA, A. (DBPOB-ATIOH OI DELAWARE runner u courosrrron ron ran amour.

Io Drawing.

This invention relates to a method and to a composition for removal of tar, and particularl road tar, from articles contaminated B there y, and particularly road vehicles.

Such roadtars include vegetable pitches,

mineral. pitches and tars, resinous bitumen, and asphalt or asphaltic substances. Such road tars areusually black or dark brown compounds of hydrogen andcarbon sometimes containing oxygen and other elements and having var ing melting points and vary: ing degrees 0 hardness. The expression road'ta-r is used herein including all such substances which are used in road construction. When such substances are applied to roads in a softened condition, due to heat or solvent, and in hot weather, they are thrown by the wheels of vehicles onto the bodies and running gears thereof, and many other 25 articles including clothing, vehicle tops and .u' holste thereby become. contaminated with roa tar. V

Substances-have been proposed heretofore for the removal of road tar from articles con-.

taminated thereby, but such substances are either lacking in solvent power for the tar or they evaporate before t efiecti the removal of the tar, or they are incapab e of sufliciently dissolving the tar, or they injure to varying d thepontaminated articles, particular the'l uer or varnishim paint with w 'ich 'vehic es are finished.

I have discovered that-amylene dichloride remove road tar from articles contamina inyury to the article and particular y without in ury to any of the'fimshes commonly appied to road vehicles. In accordance with this invention a relatively small amount of ey are capable ofthereb without Application filed Iovember 27, 1881. serial No. 577,710.

amylene dichloride isvapplied to the tar as by soppmg the amylene dichloride onto the tar by means of a cloth or similar article saturated therewith. After allowing the amylene dichloride to remain on the tar for a few minutes the tar may be wiped from surfaces to which it is adhering, or may be washed from articles, such as cloth which may have absorbed the tar, by a further application of the amylene dichloride. The time necessary for a suflicient softening of the road tar by the amylene dichloride is readily determined by observing the efiect of the amylene dichloride upon the tar; and

in some instances it may be necessary to repeat thetreatment of the tar with the amylene dichloride. V.

Amylene dichloride which is entirely suitable ior the purposes of this invention is a commerciall available mixture of the following amy ene dichlorides:

omoroncromcmcm cmcncrcncronrom ocronorom Such a mixture of amylene dichlorides has a specific gravity at 20 C. of 1.03, is free of free hydrochloric acid and of monochlorides 'of pentanes, weighs about 8.5 pounds per articles which become. contaminated with road tar and from which road tar is removed in accordance with this invention. The amylene dichlorides used in' the practice of this invention remain liquid at low temperatures, and are strong and effective solventgfi' for substantially all substances classifiable and used and have sufliciently invention, and it is not limited to the commercially available mixture referred to high boiling'points to cause them to remain on the tar to be removed for a sufiicient time to soften or dissolve the same.

Amylene dichloride of any structural formula may be employed in the practice of this above, that mixture being referred to only as an example of amylene dichloride which ma beused.

claim:

In a ,method for the removal from road vehicles and articles contaminated thereby, the steps comprising applying amylene dichloride to the contaminating tar to be removed and thereby softening the tar, and then removin the softened tar.

In testimony w ereof, I have signed my name to this specification.

- ROBERT R. VALLEE.

of road tar 

